Synthesis, Magnetic Properties, and Electronic Structure of Magnetic Topological Insulator MnBi2Se4

被引：41

作者：

Zhu, Tiancong ^{[1
]}

Bishop, Alexander J. ^{[1
]}

Zhou, Tong ^{[2
]}

Zhu, Menglin ^{[3
]}

O'Hara, Dante J. ^{[4
]}

Baker, Alexander A. ^{[5
]}

Cheng, Shuyu ^{[1
]}

Walko, Robert C. ^{[1
]}

Repicky, Jacob J. ^{[1
]}

Liu, Tao ^{[1
]}

Gupta, Jay A. ^{[1
]}

Jozwiak, Chris M. ^{[6
]}

Rotenberg, Eli ^{[6
]}

Hwang, Jinwoo ^{[3
]}

Zutic, Igor ^{[2
]}

Kawakami, Roland K. ^{[1
]}

机构：

[1] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA

[2] Univ Buffalo, Dept Phys, Buffalo, NY 14260 USA

[3] Ohio State Univ, Dept Mat Sci & Engn, Columbus, OH 43210 USA

[4] Univ Calif Riverside, Mat Sci & Engn, Riverside, CA 92521 USA

[5] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[6] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

来源：

NANO LETTERS | 2021年 / 21卷 / 12期

关键词：

Molecular beam epitaxy; magnetism; topological insulator; angle-resolved photoemission spectroscopy; HETEROSTRUCTURE;

D O I：

10.1021/acs.nanolett.1c00141

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The intrinsic magnetic topological insulators MnBi2Te4 and MnBi2Se4 support novel topological states related to symmetry breaking by magnetic order. Unlike MnBi2Te4, the study of MnBi2Se4 has been inhibited by the lack of bulk crystals, as the van der Waals (vdW) crystal is not the thermodynamic equilibrium phase. Here, we report the layer-by-layer synthesis of vdW MnBi2Se4 crystals using nonequilibrium molecular beam epitaxy. Atomic-resolution scanning transmission electron microscopy and scanning tunneling microscopy identify a well-ordered vdW crystal with septuple-layer base units. The magnetic properties agree with the predicted layered antiferromagnetic ordering but disagree with its predicted out-of-plane orientation. Instead, our samples exhibit an easy-plane anisotropy, which is explained by including dipole-dipole interactions. Angle-resolved photoemission spectroscopy reveals the gapless Dirac-like surface state, which demonstrates that MnBi2Se4 is a topological insulator above the magnetic-ordering temperature. These studies show that MnBi2Se4 is a promising candidate for exploring rich topological phases of layered antiferromagnetic topological insulators.

引用

页码：5083 / 5090

页数：8

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